AutoCodes – Isuzu – P1687 Isuzu

P1687 Isuzu Code - Automatic Transmission To Engine Control Module Signal 'B' Input High

Quick Answer

P1687 Isuzu indicates Automatic Transmission To Engine Control Module Signal 'B' Input High. Common causes include Faulty Engine Control Module (ECM), Engine Control Module (ECM) harness is open or shorted, Engine Control Module (ECM) circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P1687 Isuzu indicates Automatic Transmission To Engine Control Module Signal 'B' Input High.
Common causes: Common causes include Faulty Engine Control Module (ECM), Engine Control Module (ECM) harness is open or shorted, Engine Control Module (ECM) circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 1,716

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Dec 22, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1687 Isuzu Description

OBDII Code P1687 Isuzu - Automatic Transmission To Engine Control Module Signal 'B' Input High - AutoCodes.com — P1687 Isuzu Code - Automatic Transmission To Engine Control Module Signal 'B' Input High

What does this mean?

What are the Possible Causes of the DTC P1687 Isuzu?

Faulty Engine Control Module (ECM)
Engine Control Module (ECM) harness is open or shorted
Engine Control Module (ECM) circuit poor electrical connection

How to Fix the DTC P1687 Isuzu?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1687 Isuzu code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P1687 Isuzu code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1687 Isuzu Code

1. What are the common symptoms of OBDII code P1687 in an Isuzu vehicle?

- Common symptoms include issues with shifting gears, transmission slipping, poor fuel efficiency, and potential stalling.

2. What could cause the Automatic Transmission to Engine Control Module Signal 'B' Input High error code in an Isuzu?

- Possible causes include a faulty transmission control module, damaged wiring or connectors, or a malfunctioning engine control module.

3. How can I diagnose the P1687 code in my Isuzu?

- Diagnosing the code typically involves using an OBDII scanner to retrieve the code, inspecting the wiring and connectors for damage, and testing the transmission and engine control modules.

4. Can driving with the P1687 code present cause further damage to my Isuzu?

- Continuing to drive with this code present can potentially cause damage to the transmission or engine components, so it is best to address the issue promptly.

5. Is it safe to continue driving my Isuzu if the transmission is slipping due to the P1687 code?

- It is not recommended to drive the vehicle if the transmission is slipping, as this can lead to further damage and safety hazards. It is best to have the issue addressed by a professional.

6. How can I repair the Automatic Transmission to Engine Control Module Signal 'B' Input High error in my Isuzu?

- Repair options may include replacing faulty modules, repairing damaged wiring or connectors, or reprogramming the control modules.

7. Can I reset the P1687 code in my Isuzu by disconnecting the battery?

- Disconnecting the battery may temporarily clear the code, but it is important to address the underlying issue causing the code to prevent it from reoccurring.

8. Is the P1687 code specific to Isuzu vehicles only?

- While the code description may vary slightly between manufacturers, the P1687 code generally indicates a similar issue related to the transmission signal input in various vehicle makes and models.

9. How much does it typically cost to repair the P1687 code in an Isuzu?

- The cost of repairs can vary depending on the specific cause of the code, but it is recommended to consult with a professional mechanic for an accurate diagnosis and cost estimate.

10. Can I prevent the P1687 code from occurring in my Isuzu?

- Regular maintenance, such as checking and maintaining proper fluid levels, inspecting wiring for damage, and addressing any engine or transmission issues promptly, can help prevent the occurrence of the P1687 code.